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| TMP91CP27 Datasheet, PDF (134/246 Pages) Toshiba Semiconductor – Original CMOS 16-Bit Microcontroller | |||
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TMP91CP27
3.10.2 Operation of Each Circuit
(1) Prescaler
There is a 6-bit prescaler for generating a clock to SIO0. The clock selected using
SYSCR0<PRCK1:0> is divided by 4 and input to the prescaler as ÏT0. The prescaler
can be run only case of selecting the baud rate generator as the serial transfer clock.
Table 3.10.2 shows prescaler clock resolution into the baud rate generator.
Table 3.10.2 Prescaler Clock Resolution to Baud Rate Generator
Select
Select Prescaler
System Clock
Clock
<SYSCK>
<PRCK1:0>
Clock Gear
Value
<GEAR2:0>
1 (fs)
XXX
000 (fc)
0 (fc)
00
(fFPH)
001 (fc/2)
010 (fc/4)
011 (fc/8)
100 (fc/16)
Prescaler Input Clock
Resolution
ÏT0
fs/22
fc/22
fc/23
fc/24
fc/25
fc/26
ÏT2
fs/24
fc/24
fc/25
fc/26
fc/27
fc/28
ÏT8
fs/26
fc/26
fc/27
fc/28
fc/29
fc/210
ÏT32
fs/28
fc/28
fc/29
fc/210
fc/211
fc/212
10
(fc/16 Clock)
XXX
XXX: Donât care, â: Can not be used
â
fc/28
fc/210
fc/212
The serial interface baud rate generator selects between 4 clock inputs: ÏT0, ÏT2,
ÏT8, and ÏT32 among the prescaler outputs.
91CP27-132
2003-11-05
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